Is the AI regex generator free?

Yes — 100% free, no signup, no usage limits.

Does it save my data?

No. Inputs are processed in your browser and never uploaded to a server.

Can I use it on mobile?

Yes. The interface is fully responsive and works on iOS and Android.

Is the regex always correct?

AI-generated regex usually works on the obvious cases and breaks on edge cases. Test against real-world inputs (Unicode, edge cases, empty strings) before deploying to production.

WebGenAI

AI Regex Generator — Plain English to Regex (with Live Tester)

Describe what you want to match. Get a regex with a part-by-part breakdown — and for JavaScript flavor, a built-in live tester.

OpenAI API Key

Your key is stored only in your browser (localStorage) and sent directly to the provider. We have no backend, so it never touches our servers. Get an OpenAI API key.

How to use

Step 1: Paste an OpenAI API key
Step 2: Describe what you want to match
Step 3: Pick the regex flavor
Step 4: Generate, then test against sample text
Step 5: Copy the pattern

Always test against real-world inputs

AI-generated regex usually works on the obvious cases and breaks on the edge cases. Paste your actual sample data into the tester and confirm the matches before deploying. Edge cases that bite: empty strings, Unicode, multiline, escaped characters in your input.

Frequently asked questions

A tool that turns a plain-English description into a regex pattern with explanations and an optional live tester.